<template>
  <el-menu :default-active="this.$route.path" class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose" :collapse-transition="false" :collapse="isCollapse" background-color="#545c64" text-color="#fff" active-text-color="#ffd04b">
    <h3>{{ isCollapse ? "后台" : "通用后台管理系统" }}</h3>
    <!-- 一级菜单 -->
    <el-menu-item @click="clickMenu(item)" v-for="item in noChildren" :index="item.path + ''" :key="item.path">
      <i :class="'el-icon-' + item.icon"></i>
      <span slot="title">{{ item.label }}</span>
    </el-menu-item>

    <!-- 一级菜单 -->
    <el-submenu v-for="item in hasChildren" :index="item.path + ''" :key="item.path">
      <template slot="title">
        <i :class="'el-icon-' + item.icon"></i>
        <span slot="title">{{ item.label }}</span>
      </template>
      <!-- 一级菜单里的二级菜单 -->
      <el-menu-item-group v-for="(subItem, subIndex) in item.children" :key="subIndex">
        <el-menu-item @click="clickMenu(subItem)" :index="subItem.path + ''">{{
          subItem.label
        }}</el-menu-item>
      </el-menu-item-group>
    </el-submenu>
  </el-menu>
</template>

<style lang="less" scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
  width: 200px;
  min-height: 400px;
}
.el-menu {
  height: 100%;
  border: none;
  h3 {
    color: #fff;
    text-align: center;
    line-height: 48px;
  }
}
</style>

<script>
export default {
  data() {
    return {
      // isCollapse: false,
      menu: [
        {
          path: "/home",
          name: "home",
          label: "首页",
          icon: "s-home", //图标
          url: "Home/Home",
        },
        {
          path: "/mall",
          name: "mall",
          label: "商品管理",
          icon: "video-play",
          url: "MallManage/MallManage",
        },
        {
          path: "/user",
          name: "user",
          label: "用户管理",
          icon: "user",
          url: "UserMange/UserMange",
        },
        {
          label: "其他",
          icon: "locatio",
          children: [
            {
              path: "/page1",
              name: "page1",
              label: "页面1",
              icon: "setting",
              url: "Other/PageOne",
            },
            {
              path: "/page2",
              name: "page2",
              label: "页面2",
              icon: "setting",
              url: "Other/PageOne",
            },
          ],
        },
      ],
    };
  },
  methods: {
    handleOpen(key, keyPath) {
      console.log(key, keyPath);
    },
    handleClose(key, keyPath) {
      console.log(key, keyPath);
    },
    clickMenu(item) {
      // console.log("点击事件", item);
      this.$router.push({
        name: item.name,
      });
      this.$store.commit("selectMenu", item);
    },
  },
  //通过计算属性过滤数据
  computed: {
    noChildren() {
      // filter过滤器js
      return this.menu.filter((item) => !item.children);
      //返回没有children的数据
    },
    hasChildren() {
      return this.menu.filter((item) => item.children);
      //返回有children的数据
    },
    isCollapse() {
      return this.$store.state.tab.isCollapse;
    },
  },
};
</script>